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Porphyry
Porphyry

Gneiss
Gneiss



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Porphyry
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Gneiss

Porphyry and Gneiss

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Definition

Definition

Origin

Discoverer

Etymology

Class

Sub-Class

Group

Other Categories

Texture

Texture

Color

Maintenance

Durability

Water Resistant

Scratch Resistant

Stain Resistant

Wind Resistant

Acid Resistant

Appearance

Uses

Interior Uses

Exterior Uses

Other Architectural Uses

Construction Industry

Medical Industry

Antiquity Uses

Commercial Uses

Types

Types

Features

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Formation

Formation

Mineral Content

Compound Content

Metamorphism

Types of Metamorphism

Weathering

Types of Weathering

Erosion

Types of Erosion

Properties

Hardness

Grain Size

Fracture

Streak

Porosity

Luster

Compressive Strength

Cleavage

Toughness

Specific Gravity

Transparency

Density

Specific Heat Capacity

Resistance

Reserves

Asia

Africa

Europe

Others

North America

South America

Australia

 
Porphyry is a reddish-brown to purple igneous rock containing large phenocrysts of various minerals embedded in a fine-grained matrix
Egypt
Unknown
From Old French porfire, from Italian porfiro and in some cases directly from Latin porphyrites
Igneous Rocks
Durable Rock, Hard Rock
Plutonic
Fine Grained Rock, Opaque Rock
 
Porphyritic
Black, Brown, Green, Grey, Red, Rust, White
Less
Durable
Dull
 
Decorative Aggregates, Interior Decoration
Garden Decoration, Paving Stone
Curbing
Construction Aggregate
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Artifacts, Monuments, Sculpture
Creating Artwork, Gemstone, Jewelry
 
Rhomb Porphyry
Generally rough to touch, Is one of the oldest rock, Surfaces are often shiny
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-
-
-
-
-
-
Absent
 
Porphyry is formed in two stages: the magma cools slowly deep within the crust or the magma is cools rapidly as it erupts from a volcano, creating small grains that are usually invisible to naked eye.
Biotite, Chert, Feldspar, Garnet, Graphite, Quartz, Silica
Aluminium Oxide, CaO, Iron(III) Oxide, Potassium Oxide, MgO, Sodium Oxide, Silicon Dioxide, Titanium Dioxide
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism
Biological Weathering, Chemical Weathering
Chemical Erosion, Coastal Erosion, Glacier Erosion
 
6-7
Fine Grained
Irregular
White
Less Porous
Dull
150.00 N/mm2
-
1.7
2.5-4
Translucent to Opaque
2.5-2.52 g/cm3
0.71 kJ/Kg K
Heat Resistant, Impact Resistant
 
China, Kazakhstan, South Korea, Thailand, Turkey, Vietnam
Egypt, Ethiopia, Ghana, South Africa
Finland, France, Germany, Great Britain, Hungary, Iceland, Ireland, Italy, Netherlands, Norway, Romania, Sweden, Switzerland
Greenland
Canada, Cuba, Jamaica, USA
Bolivia, Brazil, Colombia, Ecuador, Paraguay
New South Wales, New Zealand, Western Australia
 
Gneiss is a common and widely distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either igneous or sedimentary rocks
-
Unknown
From the Middle High German verb gneist (to spark; so called because the rock glitters)
Metamorphic Rocks
Durable Rock, Hard Rock
-
Coarse Grained Rock, Medium Grained Rock, Opaque Rock
 
Banded, Foliated, Platy
Black, Brown, Pink, Red, White
More
Durable
Foliated
 
Countertops, Decorative Aggregates, Flooring, Interior Decoration
As Building Stone, As Facing Stone, Garden Decoration, Paving Stone
Curbing
As Dimension Stone
-
Artifacts
Cemetery Markers, Jewelry, Tombstones, Used in aquariums
 
Augen Gneiss, Henderson Gneiss, Lewisian Gneiss, Archean and Proterozoic Gneiss.
Generally rough to touch, Is one of the oldest rock
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Konark Sun Temple in India, Washington Monument, US
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-
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-
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Absent
 
Gneiss is a high grade metamorphic rock i.e. it has been subjected to higher temperatures and pressures than schist. It is formed by the metamorphosis of Gneiss forms from volcanic rock, shale or granitie.
Biotite, Chlorite, Feldspar, Garnet, Graphite, Hornblade, Micas, Muscovite or Illite, Quartz, Quartzite, Silica, Zircon
Aluminium Oxide, NaCl, CaO, Iron(III) Oxide, FeO, Potassium Oxide, Magnesium Carbonate, MgO, MnO, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide
Impact Metamorphism
Biological Weathering, Mechanical Weathering
Chemical Erosion, Coastal Erosion, Sea Erosion
 
7
Medium to Coarse Grained
Irregular
White
Very Less Porous
Dull
125.00 N/mm2
-
1.2
2.5-2.7
Translucent to Opaque
2.6-2.9 g/cm3
0.70 kJ/Kg K
Heat Resistant, Pressure Resistant, Scratch Resistant, Wear Resistant
 
China, India, Iran, Iraq, Kazakhstan, Kyrgyzstan, Mongolia, Russia
Cameroon, Ethiopia, Ghana, Kenya, Madagascar, Morocco, Mozambique, Namibia, Nigeria, Tanzania, Togo
Albania, Austria, Bosnia and Herzegovina, Finland, France, Georgia, Germany, Hungary, Italy, Kosovo, Monaco, Norway, Poland, Romania, Serbia, Slovakia, Slovenia, Switzerland, Ukraine, United Kingdom
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Canada, Costa Rica, Cuba, Mexico, Panama, USA
Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Peru, Venezuela
New South Wales, New Zealand, Queensland, Victoria

All about Porphyry and Gneiss Properties

Know all about Porphyry and Gneiss properties here. All properties of rocks are important as they define the type of rock and its application. Porphyry belongs to Igneous Rocks while Gneiss belongs to Metamorphic Rocks.Texture of Porphyry is Porphyritic whereas that of Gneiss is Banded, Foliated, Platy. Porphyry appears Dull and Gneiss appears Foliated. The luster of Porphyry and Gneiss is dull. Porphyry is available in black, brown, green, grey, red, rust, white colors whereas Gneiss is available in black, brown, pink, red, white colors. The commercial uses of Porphyry are creating artwork, gemstone, jewelry and that of Gneiss are cemetery markers, jewelry, tombstones, used in aquariums.